[jboss-jira] [JBoss JIRA] Assigned: (JBRULES-1435) NPE if rule checks a Long field for null, and a fact is passed in with Long field that is NOT null.

[Edson Tirelli (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBRULES-1435?page=all ]

Edson Tirelli reassigned JBRULES-1435:
--------------------------------------

    Assignee: Edson Tirelli

> NPE if rule checks a Long field for null, and a fact is passed in with Long field that is NOT null.
> ---------------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-1435
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-1435
>             Project: JBoss Drools
>          Issue Type: Bug
>    Affects Versions: 4.0.4
>         Environment: os x, jdk 1.5
>            Reporter: Alex McCarrier
>         Assigned To: Edson Tirelli
>             Fix For: 4.0.5, 5.0.0-M1
>
>   Original Estimate: 0 minutes
>  Remaining Estimate: 0 minutes
>
> If you have a fact class that has a field that is a Long:
> class MyFact {
>    Long myField = new Long(0);
>    ... 
> }
> rule CheckMyField
>    when
>       MyFact(myField == null)
>    then
>       ... do something about it ...
> end
> If you pass that fact into the engine you will get an NPE.  The problem lies in the fact that when comparing a Long against null, it thinks that since the value passed in is not null and is a Long, the second value should also be not null.  But since the rule says to check for null, it fails trying to throw a ClassCastException.  Since the second value is null, it gets an NPE trying to generate the message saying that value (null) is not of class Long.
> The problem is in org.drools.base.evaluators.ObjectFactory.ObjectEqualsComparator line 553.  When arg0 is a Number it doesn't account for the possibility that arg1 might be null.

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